Apparatus for pinning watch-balance springs



(No Model.)

B. J. HALL. APPARATUS FOR PINNINGWATGH BALANCE SPRINGS.

No. 437,345. Patented Sept. 30, 1890.

Invento T! zam'w Wit Area. T 1111) n1: noams versus 00., woman-no WASHINGTON, v.42.

UNITED I STATES PATENT OFFICE; I

EDlVIN J. HALL, OF WALTHAM, MASSACHUSETTS APPARATUS FOR PINNING WATCH-BALANCE SPRINGS;

SPECIFICATION forming part of Letters Patent No. 437,345, dated September 30, 1890.

Application filed February 25, 1889. Serial No. 301,021. (No model.)

.To all whom it may concern.-

Be it known that I, EDWIN J. HALL, a citi-.

zen of the United States, residing at Waltham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Devices for Locating and Securing Hair-Springs of a Balance-Wheel to its Stud; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of refer ence marked thereon, which form a part of this specification.

Figure l is a top view of a device embodying my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a vertical section of the same, showing the relative positions of the several parts for locating on its stud the hairspring of a balance-wheel after it has been timed and its spring clipped and holding said spring and stud while they are being secured to each other.

The mechanism to which the balance, after having been tested or timed, is to be applied to receive the stud 1) consists of a standard G, which has pivoted to its top a lever H, as shown at t. The said lever has a jaw is, which operates with another jaw Z, projecting from the top of the standard G or from a plate I, secured thereto. The jaws are closed by the cammed lever J acting against the lever H, and are opened apart by the spring m, which bears against the bottom of the chamber in the lever H, in which it is placed, and against the edge of the plate I, and moves the lever on its fulcrum when it is relieved from the pressure of the lever J. The plate I also has a stop 02' and a pin 0 erected upon it, as shown, and has a V-shaped notch o in it to receive the stud 19 to be secured to the hair-spring.

Arranged vertically on the standard G and in front of the notch 0 is a clamping-jaw K, which is secured to a slide L, adapted to move horizontally in the standard. Said slide has an opening 19, in which an eccentric q, formed on a shaft 0", works, said shaft being provided with a head 8, in which is secured a handle t, by moving which in one direction the cocentric q can be made to move the slide so as to force the jaw K against the stud p when placed in the notch 0', during which movement a spring a will be compressed between the jaw K and the standard, and by moving said handle in the opposite'direction the jaw will be moved away from the standard by the spring to. Secured to the jaw K is an ad justable rest v, which supports the stud p and admits of its being adjusted vertically, if necessary, before being clamped to the standard, and the jaw K also has a guide w at its foot, as shown.

The operation of my device is as follows: In my improved mechanism, as herein shown, the balance A being uppermost and resting with its inner periphery against the pin 0 the hair-spring is beneath the balance and has its free end carried between the jaws Z and 7c and through a hole in the stud p and against the stop n. The lever .I is next depressed, so as to move the jaw Zc' against the jaw Z to clamp the hair-spring, which is next to be pinned or secured to the stud 10. The distance from the middle of the notch o to the stop a is to be the same as the distance between the middle of the nippers and the cutting-edges of the shears of the timing mechanism, and it will thus be seen that the stud 19 will be secured to the hair-spring at exactly the same point at which said spring was grasped by the nippers at the time when.

it was clipped by the shears.

The improvements hereinbefore, described are useful auxiliaries to the mechanism shown in my patent, No. 288,233, and are essential to the successful and practical carrying out of the operation of timing watch-balances, and together form a complete apparatus for said purpose.

Having described my invention, what I claim is- 1. The mechanism, substantially as described, consisting of the standard G, provided with the slide L, the latter operated by the cam-shaft 0, having means for turning it, and also by the spring u, the jaw K, secured to said slide and having the rest 2; and guide w, the levers H and J, pivoted to said stand ard, the former having the jaw and spring m, the plate I, secured to said standard and having the jaw Z, stop n, notch 0', and pin 10 said mechanism having means of clamping and holding said spring and stud after said point has been determined, so that they can be fastened to each other, all as shown and set forth.

In testimony whereof I affix my signature in I 5 presence of two witnesses.

EDWIN J. HALL. Witnesses:

J. J'. LAUGHLIN, JAMES H. FAHEY. 

